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 ###Instrução: Qual ICAO possui um tamanho de frota de 2?
 ###Tabelas: CREATE TABLE commercial_airlines (commercial_airlines_id AUTO_INCREMENT PRIMARY KEY, Airline VARCHAR, ICAO VARCHAR, IATA VARCHAR, Callsign VARCHAR, Commenced operations INT, Fleet size INT, Headquarters VARCHAR) CREATE TABLE ique_game_boy_advance (ique_game_boy_advance_id AUTO_INCREMENT PRIMARY KEY, Chinese Title VARCHAR, Pinyin VARCHAR, Released Date INT, Genre VARCHAR, Game Modes VARCHAR) CREATE TABLE instruments_played_by_band_members (instruments_played_by_band_members_id AUTO_INCREMENT PRIMARY KEY, Paul McCartney VARCHAR, Stuart VARCHAR, McIntosh VARCHAR, Whitten VARCHAR, Linda McCartney VARCHAR) CREATE TABLE le_series_models (le_series_models_id AUTO_INCREMENT PRIMARY KEY, Colt model no. VARCHAR, Stock VARCHAR, Fire control VARCHAR, Rear sight VARCHAR, Forward assist VARCHAR, Barrel length VARCHAR, Barrel profile VARCHAR, Barrel twist VARCHAR, Hand guards VARCHAR, Bayonet Lug VARCHAR, Muzzle device VARCHAR) CREATE TABLE season_2:_1993-1994 (season_2:_1993-1994_id AUTO_INCREMENT PRIMARY KEY, No. in series INT, No. in season INT, Title VARCHAR, Director VARCHAR, Writer(s) VARCHAR, Original air date VARCHAR, Production code VARCHAR)  
SELECT ICAO FROM commercial_airlines WHERE Fleet size = 2